A dramatization of a Cytotoxic Killer T Cell inducing a cancer cell to undergo programmed cell death known as apoptosis. These Killer T Cells are part of the body's immune response system. They are programmed to seek out, attach themselves and kill cancer cells, usually using chemicals. They recognize a specific site (antigen) on the surface of cancer cells and bind to it. The Killer T Cell then eliminates the cancer cell by releasing a protein that forms pores in the cancer cell's membrane and specifically induces apoptosis.